Air Canada has suspended plans to restart operations after the union representing 10,000 flight attendants decided to defy a return-to-work order.

Air Canada is facing a crisis after its flight attendants walked off the job over the weekend and rejected a government order to return to work.The union representing 10,000 flight attendants at Canada’s biggest airline said it would request that a judge block a government order Saturday that imposed binding arbitration to resolve a labor dispute between the union and carrier.

Air Canada flight attendants returned to the picket line on Sunday defying a government-backed labour board’s order to return to work.The Canadian Union of Public Employees said in a statement that members would remain on strike and invited Air Canada back to the bargaining table.